Sort of. That would absolutely be "allowed". Now whether that is useful to write out, depends on what problem you are trying to solve.

Here is another example

https://gist.github.com/justinmeiners/0aff3d98a66b4d5f109656...

> Does the book cover all the relevant parts

No, it isn't quite so comprehensive, but it will absolutely help you get started and help you decide if you want to learn more.

https://www.amazon.com/Introduction-Graph-Theory-Dover-Mathe...